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110353 Posts in 12746 Topics by 4884 Members
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3946  Camaro Research Group Discussion / Restoration / Re: 1969 327 engine details on: April 20, 2006, 11:13:15 AM
Yup, that's correct - the water pump was in place when the engine was painted.
3947  Camaro Research Group Discussion / Maintenance / Re: Fuel / Octane Rating on: April 19, 2006, 10:52:32 AM
Thanks to JohnZ and lakeholme for responding to the questions posed by Adz28 and my self. JohnZ how do you measure the amount of advance on the mechanical and vacuum advance? Do you have to do it on a distributer machine? Can it be done on the car? Should my distributer use the small rubber bushing under the mechanical advance? Is your total advance 34 degrees or does the vac advance provide additional on top of that? (Sorry for all the questions!) I must also apologise to Adz28 for stepping on his post. He still hasn't gotton his answer to his original question about 100 and 110 octane. JohnZ, or anyone else's comments are appreciated. Thanks

You don't need a Sun machine to "map" and adjust your advance curve - all you need is a dial-back timing light to "map" what you have, and an assortment of springs to set up the curve; occasionally the stock rubber limit bushing has disappeared, but others are available in the various "advance kits" if you need them.

Your "total timing" (34-36 degrees) is the sum of initial advance plus centrifugal advance - vacuum advance doesn't enter into that equation at all, as the vacuum advance drops out when you put your foot in it - it's only in effect at idle and steady-state cruise. When checking "total timing" and setting up your curve, the vacuum advance should be disconnected and plugged, just as it is when setting initial timing.
3948  Camaro Research Group Discussion / Restoration / Re: re-stamping a block on: April 19, 2006, 10:43:23 AM
As we understand it, the NCRS says this is OK and will not penalize the car.

Just to clarify - in NCRS Flight Judging, the key is whether any part "appears" as if it could be original, not whether it IS original (there's another separate judging category for untouched absolutely original cars where only originality is judged, with no consideration for Condition - that's "Star/Bowtie" judging).

Stamp pads are judged on their own merit, and with the library of over 8,000 macro photographs of Corvette engine pads to compare against, what's "typical", what's a known factory anomaly, and what's NOT "typical" are easily detected these days. A pad either appears to be typical of factory production or it doesn't; if it doesn't, it gets the appropriate deduction. Most of the points for the block are allocated to the casting number and casting date, not to the pad; the block is allocated 350 points (out of 4500 for the whole car), and only 88 of those points relate to the pad (25 for the engine plant stamp, 25 for the VIN derivative, and 38 for the pad surface).
3949  Camaro Research Group Discussion / Maintenance / Re: Fuel / Octane Rating on: April 18, 2006, 11:55:58 AM
My '69Z runs fine on 93 octane pump premium, with no detonation issues. I run 8* initial advance, with about 26* centrifugal, all in by 2800, and a NAPA/Echlin VC-1810 vacuum advance can that's fully-deployed at 8" Hg. and connected to full manifold vacuum. The late-closing intake valve and high overlap of the "30-30" cam brings the DCR down; a milder cam with an earlier-closing intake valve and less overlap will result in detonation with the stock 11:1 compression.
3950  Camaro Research Group Discussion / Restoration / Re: 69 Z28 engine dates on: April 18, 2006, 11:45:42 AM
Four months is a bit of a stretch, although in NCRS judging we allow up to six months, recognizing that strange things happened occasionally. I'm not sure what the Camaro judging rules allow - have never seen anything published.
3951  Camaro Research Group Discussion / General Discussion / Re: small block vs. big block motor mount towers on: April 18, 2006, 11:37:29 AM
Are big block motor mount towers always different from small block motor mount towers?

The car is at the body shop now and a 402 big block is at the shop right now getting done and I was wondering if we need to ordeer big block motor mount towers OR if there is a chance the ones currently installed will work.

Yup, big-block towers are different - they move the engine over about an inch to the right of car centerline for clearance to the steering gear.
3952  Camaro Research Group Discussion / Restoration / Re: ac delco voltage regulator part number for 68 L34? on: April 16, 2006, 10:00:56 AM
Ed, almost all midyear Corvettes used the 1119515, and I've never seen a production 515 with anything but a screw-attached cover; have never seen one with rivets.
3953  Camaro Research Group Discussion / Originality / Re: 69 Camaro Z/28 front sway bar and power steering bracket on: April 16, 2006, 09:51:05 AM
There were five over-the-counter front stabilizer bars available, from 3/4" to 1-1/16", and there were five over-the-counter HD springs from 500 to 777 pounds per inch; the 3935784 was among them, and has a load rate of 615 pounds per inch. The 15/16" stabilizer bar was P/N 3962797.
3954  Camaro Research Group Discussion / Decoding/Numbers / Re: Hurst shifter,shifter boot on: April 16, 2006, 09:40:13 AM
None of those numbers match up with the numbers for any of the boots/seals used on '69 Camaros; may be aftermarket parts.
3955  Camaro Research Group Discussion / Restoration / Re: 68 Trunk Lid Emblem Location on: April 15, 2006, 02:39:12 PM
Don't know if '68 is the same, but my original '69 spoiler Z/28 has the bottom edge of the "by Chevrolet" bar 1-1/4" forward of the edge of the spoiler, and the outboard edge of the bar is 4-1/2" from the edge of the deck lid.
3956  Camaro Research Group Discussion / Maintenance / Re: One More 68 Electrical Challenge on: April 13, 2006, 01:01:59 PM
Sounds like you've got an open in the main power distribution circuit; not sure if '68 is like '69, but power is fed to the fuse block from the battery via a pigtail (from the + battery terminal) to a plastic junction block behind the battery, then from there to the horn relay, and from there via a big red wire into one of the multiple connectors on the engine compartment side of the fuse block. If the terminals in those connectors get corroded, resistance builds up (which creates heat), and the "big red wire" connection can go open due to partial melting/distortion of the cavity in the connector for that wire. I'd pull those connectors off and check the terminals for corrosion/misalignment.
3957  Camaro Research Group Discussion / General Discussion / Re: Question about cowl tag on: April 13, 2006, 12:51:15 PM
The J294 is an internal scheduling code used only at Van Nuys; it's not related to the car's configuration.
3958  Camaro Research Group Discussion / Decoding/Numbers / Re: What? on: April 12, 2006, 01:06:55 PM
Must be the passenger car 350 - all Corvette small-blocks were built at Flint.  Smiley
3959  Camaro Research Group Discussion / Restoration / Re: Wiring harness snafoos! Help! on: April 11, 2006, 11:03:37 AM
I don't have a '68 wiring diagram, but those items are all fed from the accessory buss in the fuse block - I'd look for a bad fuse, bad fuse clips, or a bad connection inside the fuse block for that circuit.
3960  Camaro Research Group Discussion / Restoration / Re: Wiring harness snafoos! Help! on: April 10, 2006, 04:14:19 PM
Everything seams to be working except: wiper motor, heater fan, radio. I have tested these systems directly from the battery and the wiper motor, fan blower etc work. But there is no juice at the fuse block. Do these systems get there power only after the key is in the on position?

Yup, those items only get power with the ignition in the "on" position.
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